The Perseus Project at Tufts University is the foremost Digital Library for the classical world, if not for the Humanities in general. In its collection of Greek and Roman materials, readers will find many of the canonical texts read today.
The Greek collection approaches 8 million words and the Latin collection currently has 5.5 million. In addition, many English language dictionaries, other reference works, translations, and commentaries are included, so that anyone with an internet connection has access to the equivalent of a respectable College Classics library.
The Perseus site is further enriched by intricate linking mechanisms among texts (resulting in more than 30 million links).
From the Perseus site, 2005-07-25:
Perseus is an evolving digital library, engineering interactions through time, space, and language. Our primary goal is to bring a wide range of source materials to as large an audience as possible. We anticipate that greater accessibility to the sources for the study of the humanities will strengthen the quality of questions, lead to new avenues of research, and connect more people through the connection of ideas.